Christina Aguilera Looks Unrecognizable With Blonde Hair and Tight Black Dress: 'Wouldn't Have Guessed Who This Was'

Christina Aguilera shocked fans on social media with her latest look.

The pop star, 45, looked almost completely unrecognizable when she stepped out to attend the 20th Anniversary Gala for the Prince Albert II of Monaco Foundation in Monaco on Friday, September 18.

The "Fighter" crooner wore her platinum blonde hair in light waves and rocked a tight black gown that featured a plunging neckline and thigh-high slit.

She also added a silver-studded black choker for a more dramatic effect.

Users online were shocked over Aguilera's new appearance, with one person writing on X: "Wouldn’t have guessed who this was in a million years."

"I want her doctor’s card," someone joked, with another user penning: "I'm not saying this isn't an attractive older woman, but she just looks so... different. I hate plastic surgery so much."

Someone else chimed in: "Can she move? She looks like her face is stuck."

Aguilera's physique was further questioned, with another fan saying she "looks like a bad wax figure of herself."

"She looks awful, just wish women would age gracefully," another user added. "She looks like a real life plastic Barbie," someone wrote.

While Xtina has never publicly confirmed if she's ever gone under the knife, a source shed some light on her potential procedures to RadarOnline.com last year.

"She's going to the plastic surgeon's office for regular nip/tucks that no one around her thinks she needs," the insider claimed to the outlet. "The stuff they say she's had done is astounding, everything from Botox to fillers, liposuction, b----- implants, and lasering."

"She eats like a sparrow and she's lost a ton of weight," another source said. "She's been going overboard for a long time and her skin-and-bones frame is a shocking sight to behold."

"She's constantly on a diet and measuring portions when she does eat," they added. "It must be having a detrimental effect on her health by now."

According to one source, Aguilera has also become "addicted" to cosmetic surgeries.

Reports also surfaced in recent months the Burlesque star has been using GLP-1 injections to lose extra weight. However, one medical expert explained to RadarOnline.com taking weight-loss drugs isn't the best idea.

"If she's using Ozempic, that's not a good idea – unless it's for diabetes. Weight loss is a side effect of the medication, [but] it's not what it's for. There are risks involved, including constant nausea, abdominal pain, constipation, diarrhea and vomiting," they noted.